Had as series of phone interviews/preparation with the recruiter leading up to the group interview at the office. I felt like the recruiter prepared me very well; the content of the interview, from the structure down to the exact questions, were predictable. He was also helpful in drilling me on some of the expected questions and encouraging me to do my research on the company. From what I could tell from my group interview, if you were offered an interview, then you probably have the skill set and they're just evaluating to see if you fit the company culture. I'm pretty sure everyone else had the same treatment given the cookie cutter parroting from the expected question, "What do you think are BW's principles?"
In general, the company's principles sound fine on paper, but I did feel weird about some of the boundaries of this "openness and transparency". I sort of felt like I crossed a line when I was read the exact reviews of people who failed the interviews in the past. I was really baffled at why they wanted all these aggressive traits in an admin--some of the reasons for failing generally included "tried too hard to compromise (in group case study) and not stand up for his/her POV" etc.
Group interview included a "case study" which is really just an exercise to see who is the most loud-spoken. Don't be afraid to speak against the group's decisions. Also, there's an important period of "reflection" after the exercise--I personally hate repeating what others say for the sake of hearing my own voice, but in this scenario definitely speak up no matter what. Then they went around and asked people one-by-one what they knew about BW's culture and their biggest weakness.
In the end, I was pretty aware that I could have done better at being aggressive in answering and wasn't really surprised when I wasn't given an offer. The interview prep was a good experience though, and a great exercise for analyzing your own weaknesses and finding a way to frame your response to interviewers.